Virginia's Declaration of Rights was drawn upon by Thomas Jefferson for the opening paragraphs of the Declaration of Independence. It was widely copied by the other colonies and became the basis of the Bill of Rights.
The ridges found in flexible metal duct create turbulence and will diminish airflow. NEVER use 4 dryer duct or any plastic duct on a range hood installation. The minimum size duct allowed on most range hoods is 3 Â¼ by 10 which is equivalent to 6 round. More powerful hoods require even larger duct sizes up to 10 round. Consult the specifications for the model you have chosen.
However, we recommend allowing 28- 36 between the bottom of the vent hood and your cooking surface. Less than 28 from the cooktop will be too hot, and more than 36 from the cooktop will start to decrease the efficiency of your range hood in capturing steam, grease, odors, and even toxic chemicals released from cooking. The average height is normally 32 above the cooking surface.